A certificate of deposit is a savings account where you lock up your money for a set time in exchange for a higher interest rate

When you open a CD, you give a bank or credit union a lump sum of money — say $5,000 — and agree not to touch it for a specific period. That period might be three months, one year, five years, or longer. In return, the bank pays you a fixed interest rate that is almost always higher than what you would earn in a regular savings account. At the end of the term, you get your original money back plus the interest you earned.

The trade-off is simple: you lose access to your cash for the duration. If you withdraw the money early, the bank charges you a penalty — usually a few months' worth of interest. That penalty exists because the bank counts on having your money available for the full term and has already committed to paying you that rate.

CDs are insured by the Federal Deposit Insurance Corporation (FDIC) if you open one at a bank, or by the National Credit Union Administration (NCUA) if you open one at a credit union. That means if the institution fails, the government protects your deposit up to $250,000. This makes CDs one of the safest places to put money.

Key Takeaways

  • You deposit a fixed amount of money for a fixed period and receive a may provide interest rate that does not change.
  • The longer the term, the higher the rate is usually — a five-year CD typically pays more than a one-year CD.
  • Withdrawing money before the term ends triggers an early withdrawal penalty, usually several months of interest.
  • Your deposit is insured up to $250,000 by the FDIC or NCUA, so your principal is protected even if the bank fails.
  • Interest rates on CDs move with the broader economy, so rates available today will not be the same next month or next year.

How the interest rate and term length work together

Banks set CD rates based on what the Federal Reserve is doing with short-term interest rates. When the Fed raises rates, new CDs pay more. When the Fed cuts rates, new CDs pay less. The rate you lock in on the day you open the CD stays the same for the entire term — that is the whole point. You are protected from rates falling, but you also miss out if rates rise.

Term length is the other half of the equation. A three-month CD will pay less than a one-year CD at the same bank on the same day. A five-year CD will pay more than a one-year CD. Banks do this because they want to keep your money longer and will pay more to make that happen. The difference between a short-term rate and a long-term rate is called the yield curve. When the yield curve is steep, the difference is large. When it is flat, the difference is small.

You can compare rates across banks because they are all quoting the same thing: the annual percentage yield, or APY. This is the total return you will earn in one year, including compounding. A CD paying 4.50% APY will earn you more than one paying 4.25% APY, all else equal.

What happens when your CD matures

On the maturity date — the last day of your term — the bank automatically moves your principal plus interest into your regular savings or checking account. You do not have to do anything. The money is yours to withdraw or spend.

Most banks also offer a grace period, usually seven to ten days, during which you can decide what to do next. If you do nothing during that window, the bank will roll your CD into a new one at the current rate for the same term length. That new rate might be higher or lower than what you earned before. If you do not want to renew, you can withdraw the money or move it elsewhere.

Some people use CDs as a ladder: they open multiple CDs with different maturity dates so that money becomes available at regular intervals. For example, you might open five one-year CDs in consecutive months. Each month, one matures, and you can decide whether to spend it, reinvest it, or move it to a different account.

Early withdrawal penalties and when they matter

If you need your money before the term ends, you can withdraw it, but the bank will charge a penalty. The penalty is usually expressed as a number of months of interest. A CD with a three-month penalty means you lose three months' worth of the interest you would have earned. On a $10,000 CD paying 4% APY, that is roughly $100.

The penalty structure varies by bank and by term length. Longer-term CDs often have larger penalties because the bank is giving up more certainty. Some banks charge a flat dollar amount instead of months of interest. Before you open a CD, read the disclosure document to see exactly what the penalty is — it will be stated clearly.

The penalty is deducted from your interest earnings first. If you have not earned enough interest yet to cover the penalty, the bank takes the difference from your principal. This is rare with short-term CDs but can happen if you withdraw very early from a long-term CD.

CDs versus savings accounts and money market accounts

A regular savings account has no term and no penalty. You can withdraw money anytime. In exchange, the interest rate is lower — often less than 1% APY. A money market account is a hybrid: it pays more than a savings account but less than a CD, and you can usually write checks or make a few withdrawals per month without penalty.

A CD pays the most because you are giving up liquidity — the ability to access your cash whenever you want. If you know you will not need the money for a year or more, a CD is the better deal. If you might need it sooner, the penalty could wipe out the extra interest you earned, making a savings account the smarter choice.

The difference in rate between a CD and a savings account at the same bank can be substantial. A savings account might pay 0.01% while a one-year CD pays 4.50%. On $10,000, that is the difference between $1 and $450 per year. But that advantage only matters if you actually leave the money untouched for the full term.

How to compare CDs across different banks

Banks compete on rate, term length, and minimum deposit. Some require $500 to open a CD; others require $25,000. Some offer terms as short as one month; others start at six months. The APY is what you compare directly — higher is better, all else equal.

Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs. A national online bank might offer 4.75% on a one-year CD while a local bank offers 4.25% for the same term. Both are FDIC-insured, so the safety is identical. The difference is pure rate.

You can also compare the early withdrawal penalty across banks. Some banks have gentler penalties than others. If you think there is any chance you might need the money early, a bank with a lower penalty is worth choosing even if the rate is slightly lower.

Special CD types and when they make sense

Most CDs are straightforward: fixed rate, fixed term, fixed penalty. But some banks offer variations. A no-penalty CD lets you withdraw your money without a penalty, though the rate is lower than a traditional CD. A bump-up CD lets you request a rate increase once if rates rise during your term. A step-up CD automatically increases your rate at set intervals.

These variations exist because banks are trying to attract customers in different situations. A no-penalty CD makes sense if you want the higher rate of a CD but are genuinely uncertain about needing the money. A bump-up CD makes sense if you think rates might rise and you want a chance to benefit. A step-up CD is useful if you want predictable growth over a long term.

Read the fine print on any variation. A no-penalty CD might limit how many times you can withdraw, or it might only allow one withdrawal. A bump-up CD might limit you to one rate increase. These restrictions are how banks keep the rate competitive while managing their risk.

Frequently Asked Questions

Can I open a CD if I do not have much money to start with?

Minimum deposits vary by bank and by CD type. Some banks require $500 or $1,000; others require $25,000 or more. Many online banks have minimums as low as $100 or $500. Check the bank's website or call to confirm the minimum before you apply.

What happens to my CD if the bank fails?

Your deposit is insured by the FDIC (at banks) or NCUA (at credit unions) up to $250,000. If the bank fails, the insurance agency pays you your principal plus any interest earned up to the maturity date. You are protected even if the bank goes under.

Can I add more money to my CD after I open it?

Most CDs do not allow additional deposits after opening. You deposit a lump sum on day one, and that is the amount that earns interest for the full term. Some banks offer add-on CDs, but these are less common. Ask the bank before you open the account if adding money later matters to you.

Is the interest I earn on a CD taxable?

Yes. The interest you earn on a CD is ordinary income and is taxable in the year you earn it, even if you do not withdraw the money until the CD matures. The bank will send you a 1099-INT form at tax time showing how much interest you earned. This is one reason CDs are better for taxable accounts than for retirement accounts where growth is tax-deferred.

What if I need my money but do not want to pay the early withdrawal penalty?

Your only option is to pay the penalty. You cannot avoid it by withdrawing the money gradually or by transferring the CD to another bank. If the penalty is steep and you need the money, a personal loan or line of credit might be cheaper, though you would pay interest on that instead. Compare the costs before you decide.